Observation of the $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ decay and measurement of its branching ratio

NA62 Collaboration

A measurement of the $K^{+}\to {\pi }^{+}\nu \bar{\nu }$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, afte…